I decided to try out the stair master for the first time. Three things are important:

1) The gym had those really full-on tall ones a bit like this.
2) They were positioned next to the floor to ceiling windows facing a busy highstreet
3) The proper free weight training area and squat racks were right behind them

So I got on the machine and started climbing. I set it to interval training (Why did I do this?!??!?!?!?!?!?). Everything was fine but it was going reaaaaaally slowly, so I increased the speed a bit. Nothing changed. Waited a bit longer and increased the speed again. No difference. Increased the speed again. Nothing.

Suddenly after about three minutes THE NEW INTERVAL KICKED IN WITHOUT ANY WARNING, NO BEEPS, NO NOTHING and the speed went up dramatically. I gallently kept up for maybe 0.5 seconds before my feet tripped over themselves and I fell ALL THE WAY down the stairs. To make it even worse, I was trying to frantically mash the stop button that was just out of reach so I didn't even let go and was stuck there flailing around like a fish, with one hand desperately holding on to the railing. Eventually I let go and ended up on the floor in a heap right infront of the windows and infront of all the Serious Weight LiftersTM who were politely pretending like nothing had happened.

Falling over in the forest probably (is a massive steep hill and very slippy). Was wearing a white shirt and squelched hard in the deep mud. Fortunately my boobs took most of the impact but still twisted my arm funny